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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Barber, J. F.;
Martin, D. L.;
Conway, K. E. |
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| Author Affiliation: | Departments of Horticulture and Plant Pathology, Oklahoma State University, Stillwater, OK |
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| Title: | Evaluation of fungicides for preventative control of brown patch on bentgrass in Oklahoma, 1990 |
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| Source: | Fungicide and Nematicide Tests. Vol. 46, 1991, p. 300. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Research; Diseases; Disease control; Agrostis stolonifera; Brown patch; Rhizoctonia cerealis; Vinclozolin; Phytotoxicity; Fungicides; Fungicide application
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| Abstract/Contents: | "The site for the evaluation was a 'Pennlinks' creeping bentgrass golf green (90-10% sand-organic matter, pH 7.4) located at Stillwater, OK. The green was maintained at 0.19 in. mowing height, with 1.0 lb N.1000 ft2 applied monthly. Irrigation was supplied to prevent visual moisture stress. Experimental units were 3 x 12 ft plots consisting of a 2 x 12 ft treatment area and a 1 x 12 ft paired untreated check. A randomized complete block design with 3 replications was used. Each plot was subdivided into 3 sections and a different section was used for 7 and 14 days after treatment (DAT). Twenty-four treatments were applied on 25 Jun 90 with a CO2 powered sprayer at 40 psi. Each 3 x 4 ft subdivision was inoculated with Rhizoctonia cerealis infected rye grains 5 days before rating. A natural infestation of Rhizoctonia cerealis occurred over the entire experimental area. The infestation was used to evaluate treatments on 3 Jul 90 (7DAT) and 9 Jul 90 (14DAT). Disease severity was evaluated by rating the plot and untreated check for disease on a 0 to 10 scale (i.e., 0 = no disease and 10 = completely blighted). Disease control was calculated (i.e., [(check - treated)/check] x 100) to adjust for variability of brown patch infestation across the experimental area. Plots with 0 values for control were eliminated from the experiment. Eight of the 24 fungicide treatments were duplicate treatments on creeping bentgrass fertilized with Ringers 10-4-4 Turf Restore. Scott ProTurf HD 22-0-16 Greens fertilizer was used on the other 16 treatments. Phytotoxicity was rated on a 0 to 10 scale (i.e., 0 = no damage and 10 = plant death) for all treatments on 14DAT. Disease pressure was light during the experiment due to weather conditions. Vorlan 25WP + Fungo 25WP has consistently had excellent control of brown patch in experiments at Oklahoma State University. The experimental compounds MON24024 25WP, SAN-832F 50WP and SAN-619 40WG have excellent potential for preventative brown patch control. The Turf Restore did not have any activity by itself or in combination with most products. Phytotoxicity was noted on turf treated with San-619F 40WG and San-832F 50WP. The phytotoxicity was linked to an increased intensity of green color." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract, with table, only!
Table |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Barber, J. F., D. L. Martin, and K. E. Conway. 1991. Evaluation of fungicides for preventative control of brown patch on bentgrass in Oklahoma, 1990. Fungicide Nematicide Tests. 46:p. 300. |
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